{"openapi": "3.1.0", "info": {"title": "ABC to Audio API", "version": "1.0.0"}, "paths": {"/convert": {"post": {"summary": "Convert ABC notation to audio", "operationId": "convertABC", "requestBody": {"required": true, "content": {"application/json": {"schema": {"type": "object", "properties": {"abc_notation": {"type": "string", "description": "The ABC notation to be converted."}}}}}, "responses": {"200": {"description": "Successful operation", "content": {"application/json": {"schema": {"type": "object", "properties": {"audio_url": {"type": "string", "description": "URL to the generated audio file."}}}}}}, "400": {"description": "Invalid input"}}}}}}}